linux-kernel - Re: [PATCH net-next v2 0/4] net: mitigate retpoline overhead

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Date:   Wed, 05 Dec 2018 20:49:58 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, pjt@...gle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 0/4] net: mitigate retpoline overhead

From: Paolo Abeni <pabeni@...hat.com>
Date: Wed,  5 Dec 2018 19:13:38 +0100

 ...
> This may lead to some uglification around the indirect calls. In netconf 2018
> Eric Dumazet described a technique to hide the most relevant part of the needed
> boilerplate with some macro help.
> 
> This series is a [re-]implementation of such idea, exposing the introduced
> helpers in a new header file. They are later leveraged to avoid the indirect
> call overhead in the GRO path, when possible.
> 
> Overall this gives > 10% performance improvement for UDP GRO benchmark and
> smaller but measurable for TCP syn flood.
> 
> The added infra can be used in follow-up patches to cope with retpoline overhead
> in other points of the networking stack (e.g. at the qdisc layer) and possibly
> even in other subsystems.
 ...

I like this a lot and unless I hear some objections I'm going to apply this
series tomorrow.

Thanks for working on this Paolo.